CN102072694B - Eddy current distance sensor - Google Patents
Eddy current distance sensor Download PDFInfo
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- CN102072694B CN102072694B CN 201010590458 CN201010590458A CN102072694B CN 102072694 B CN102072694 B CN 102072694B CN 201010590458 CN201010590458 CN 201010590458 CN 201010590458 A CN201010590458 A CN 201010590458A CN 102072694 B CN102072694 B CN 102072694B
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Abstract
The invention discloses an eddy current distance sensor which comprises a coil, an eddy current measurement circuit and an amplifier, wherein the coil is used for generating a magnetic field; the eddy current measurement circuit is connected with the coil and used for generating a first output voltage according to the magnetic field; and the amplifier is used for amplifying the first output voltage to obtain a second output voltage. By using the invention, the measurement distance of the eddy current distance sensor can be increased in the condition that the coil installation space of the eddy current distance sensor is limited.
Description
Technical field
The present invention relates to fields of measurement, in particular to a kind of current vortex range sensor.
Background technology
Metal as piece is in when moving in the magnetic field that is changing or in magnetic field, all can produce induction electromotive force in metallic object, is called eddy current.When magnetic field is when being produced by electric current, the eddy current that produce this moment becomes current vortex.
Scales based on eddy current effect is eddy current sensor.As shown in Figure 1, the magnetic field H 2 that in the magnetic field H 1 that produces due to coil and measured conductor, current vortex produces influences each other, the equiva lent impedance of coil is changed, this change with geometric configuration, physical dimension, power frequency and the coil of metallic object magnetic permeability, conductivity, coil to the measured conductor surface apart from relating to parameters such as x.Affect parameter beyond fixed range x, the equiva lent impedance by the judgement coil can record the size apart from x.
The measuring distance of current vortex range sensor generally is directly proportional to the D outer diameter of coil, and effective measuring distance x and the D relation of sensor are approximately: x=1.17*D.
In the situation that coil outer diameter is fixing, because the current vortex range sensor measuring distance is limited, its installation site or application are limited to, and when larger apart from the x variation range, sensor and measured body can occur and bump against and the phenomenon of damage sensor.
For in correlation technique in the situation that the coil installing space of current vortex range sensor is limited, the problem that the measuring distance of this current vortex range sensor is more limited not yet proposes effective solution at present.
Summary of the invention
For in correlation technique in the situation that the coil installing space of current vortex range sensor is limited, the problem that the measuring distance of this current vortex range sensor is more limited and propose the present invention, for this reason, fundamental purpose of the present invention is to provide a kind of current vortex range sensor, to address the above problem.
To achieve these goals, according to an aspect of the present invention, provide a kind of current vortex range sensor.This current vortex range sensor comprises: coil, for generation of magnetic field; The electric eddy current measurement circuit is connected with coil, is used for producing the first output voltage according to magnetic field; Amplifier is used for the first output voltage is amplified, and obtains the second output voltage.
Further, amplifier is [5,10] to the enlargement factor of the first output voltage.
To achieve these goals, according to a further aspect in the invention, provide a kind of current vortex range sensor.This current vortex range sensor comprises: coil, for generation of magnetic field; The electric eddy current measurement circuit is connected with coil, is used for producing the first output voltage according to magnetic field; Differential amplifier is used for the difference of the first output voltage and reference voltage is amplified, and obtains the second output voltage.
Further, differential amplifier comprises: first input end is used for input the first output voltage; The second input end is used for input reference voltage; Output terminal is used for output the second output voltage.
Further, differential amplifier is [5,10] to the enlargement factor of the difference of the first output voltage and reference voltage.
Further, differential amplifier is differential amplifier circuit, and this differential amplifier circuit comprises: operational amplifier; The first resistance and second resistance of mutually connecting, first end is connected in the output terminal of the first output voltage, and the second end is connected in the output terminal of operational amplifier, and wherein, the first input end of operational amplifier is connected between the first resistance and the second resistance; The 3rd resistance, first end are connected in the output terminal of reference voltage, and the second end is connected in the second input end of operational amplifier; The 4th resistance, first end are connected between the 3rd resistance and operational amplifier, the second end ground connection.
Further, differential amplifier is differential amplifier circuit, and this differential amplifier circuit comprises: substracting unit, for the difference of calculating the first output voltage and reference voltage; Operational amplifier is used for difference is amplified.
By the present invention, adopt the current vortex range sensor of following structure: coil, for generation of magnetic field; The electric eddy current measurement circuit is connected with coil, is used for producing the first output voltage according to magnetic field; Amplifier, be used for the first output voltage is amplified, obtain the second output voltage, make the measuring distance of the current vortex range sensor of installing at same installing space greatly increase, solved in the correlation technique electric in the situation that the coil installing space of current vortex range sensor is limited, the problem that the measuring distance of this current vortex range sensor is more limited, and then reached in the situation that the coil installing space of current vortex range sensor is limited, increase the effect of current vortex range sensor measuring distance.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram according to the current vortex sensing of correlation technique;
Fig. 2 is the schematic diagram according to the current vortex range sensor of first embodiment of the invention;
Fig. 3 is the schematic diagram according to the current vortex range sensor of second embodiment of the invention;
Fig. 4 is the schematic diagram according to the electric eddy current measurement circuit of the embodiment of the present invention; And
Fig. 5 is the schematic diagram according to the differential transport and placing device of the embodiment of the present invention.
Embodiment
Need to prove, in the situation that do not conflict, embodiment and the feature in embodiment in the application can make up mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
Fig. 2 is the schematic diagram according to the current vortex range sensor of first embodiment of the invention.
As shown in Figure 2, A1 is the electric eddy current measurement circuit, such as constant frequency amplitude modulation, FMAM formula etc.; Vout10 is the output voltage of metering circuit, and Vout10 changes with the variation of distance x, and when distance was a, the output voltage of A1 was Vout10 (a); A2 is amplifier; Vout20 is the output voltage of A2.
As described in Figure, the embodiment of the present invention provides a kind of current vortex range sensor.This current vortex range sensor comprises: coil, for generation of magnetic field; The electric eddy current measurement circuit is connected with coil, is used for producing the first output voltage according to magnetic field; Amplifier A1 is used for the first output voltage is amplified, and obtains the second output voltage.
Preferably, amplifier is [5,10] to the enlargement factor of the first output voltage.
The embodiment of the present invention also provides a kind of current vortex range sensor.
Fig. 3 is the schematic diagram according to the current vortex range sensor of second embodiment of the invention.
As shown in Figure 3, A1 is the electric eddy current measurement circuit, such as constant frequency amplitude modulation, FMAM formula etc.; Vout1 is the output voltage of metering circuit, and Vout1 changes with the variation of distance x, and when distance was a, the output voltage of A1 was Vout1 (a); Vref is reference voltage, and Vref equals Vout1 (a); A2 is differential amplifier; Vout2 is the output voltage of A2
As shown in the figure, this current vortex range sensor comprises: coil; The electric eddy current measurement circuit is connected with coil, is used for producing the first output voltage according to magnetic field; Differential amplifier is used for the difference of the first output voltage and reference voltage is amplified, and obtains the 3rd output voltage.
Preferably, differential amplifier comprises: first input end is used for input the first output voltage; The second input end is used for input reference voltage; Output terminal is used for output the 3rd output voltage.
Preferably, differential amplifier is [5,10] to the enlargement factor of the difference of the first output voltage and reference voltage.
Preferably, differential amplifier is differential amplifier circuit, and this differential amplifier circuit comprises: operational amplifier; The first resistance and second resistance of mutually connecting, first end is connected in the output terminal of the first output voltage, and the second end is connected in the output terminal of operational amplifier, and wherein, the first input end of operational amplifier is connected between the first resistance and the second resistance; The 3rd resistance, first end are connected in the output terminal of reference voltage, and the second end is connected in the second input end of operational amplifier; The 4th resistance, first end are connected between the 3rd resistance and operational amplifier, the second end ground connection.
Further, differential amplifier is differential amplifier circuit, and this differential amplifier circuit comprises: substracting unit, for the difference of calculating the first output voltage and reference voltage; Operational amplifier is used for difference is amplified.
Describe below in conjunction with the principle of work of accompanying drawing to the electric eddy current measurement circuit of the embodiment of the present invention.
As shown in Figure 3, the distance of cell winding and measured body 1 is x.To be converted into apart from the variation of x the variation of voltage Vout1 by metering circuit A1, amplify output voltage signal Vout2 after then Vout1 and reference voltage V ref being subtracted each other by A2.Due to Vref=Vout (a), so when x≤a, the size by Vout1 can draw current distance; When x＞a, the size by Vout2 draws current distance.Because voltage signal Vout2 has very high sensitivity, so can measure larger distance.The pass of Vout1, Vref, Vout2 is:
When Vout1＞Vref: Vout2=N* (Vout1-Vref), N are the enlargement factor of differential amplifier A2;
When Vout1≤Vref: Vout2=0.
In addition, directly by amplifying Vout1, that is: Vout2=N*Vout1, also can realize telemeasurement by Vout2, and the structure of the electric eddy current measurement circuit in this kind situation is simpler, as shown in Figure 2.
Fig. 4 is the schematic diagram according to the electric eddy current measurement circuit of the embodiment of the present invention.
as shown in Figure 4, this electric eddy current measurement circuit comprises: coil L, with unit under test 1 distance be X, capacitor C, and coil L is connected in parallel between first node and Section Point, phase inverter A15, one end is connected in the first input end of amplifier A10 via resistance R 2, the other end is connected in the output terminal of amplifier A13, wherein, the second input end of amplifier A10 is via resistance R 1 ground connection, output terminal is connected via the first input end of the 3rd node with amplifier A13, the second input end of amplifier A13 is connected in the output terminal of amplifier A13 via feedback element A14, wherein, described first node is connected between the first input end of resistance R 2 and amplifier A10, described Section Point is connected to Vout1 via the 3rd node and rectification unit A16 respectively, wherein, output voltage V sin obtains output voltage V out1 after rectification unit A16.
As shown in the figure, the variation apart from x can be converted into the variation of output signal Vout1.The telefault L negative feedback that afterwards access operational amplifier A 10 in parallel with capacitor C.VSIN is sinewave output, and its amplitude is subjected to affect apart from x.Operational amplifier A 12 is used for limiting the sinusoidal wave rise time with feedback element A14.The output VA2 of A13 is transformed to square wave by phase inverter A15, and then square wave drove LC shunt circuit generation vibration afterwards through R2.Can control the amplitude of VSIN by the size of adjusting R2.VSIN is by output direct current signal Vout1 after rectification unit A16.
Fig. 5 is the schematic diagram according to the differential discharge circuit of the embodiment of the present invention.
As shown in the figure, this differential amplifier circuit comprises: operational amplifier A 21; The first resistance R 1 and second resistance R 2 of mutually connecting, first end is connected in the output end vo ut1 of the first output voltage, the second end is connected in the output terminal of operational amplifier, and wherein, the first input end of operational amplifier A 21 is connected between the first resistance R 1 and the second resistance R 2; The 3rd resistance R 3, first end is connected in the output terminal of reference voltage V ref, and the second end is connected in the second input end of operational amplifier A 21; The 4th resistance R 4, first end are connected between the 3rd resistance R 3 and operational amplifier A 21, the second end ground connection.
The present invention can make in the situation that the coil installing space of current vortex range sensor is limited; increase the current vortex range sensor measuring distance; namely; when using the identical coil of original design proposal; can measure even more at a distance so that measuring distance x has reached 1.67*D, realized telemeasurement; reduced the restriction of installing space to installation of sensors, and the protection sensor is not damaged when distance x variation is excessive.
The above is only the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. a current vortex range sensor, is characterized in that, comprising:
Coil is for generation of magnetic field;
The electric eddy current measurement circuit is connected with described coil, is used for producing the first output voltage according to described magnetic field; And
The 3rd amplifier is used for described the first output voltage is amplified, and obtains the second output voltage;
Described electric eddy current measurement circuit comprises coil, electric capacity, phase inverter, the 5th resistance, the 6th resistance, the first amplifier, the second amplifier, feedback element and rectification unit; Wherein,
Described electric capacity and described coils from parallel connection of coils are connected between first node and Section Point;
Described phase inverter one end is connected in the first input end of the first amplifier via the 6th resistance, the other end is connected in the output terminal of the second amplifier;
The second input end of described the first amplifier is via the 5th resistance eutral grounding, and output terminal is connected via the first input end of the 3rd node with the second amplifier;
The second input end of described the second amplifier is connected in the output terminal of the second amplifier via described feedback element;
Wherein, described first node is connected between the first input end of the 6th resistance and the first amplifier, and described Section Point is connected with described rectification unit via the 3rd node, and the output terminal of described rectification unit is described the first output voltage.
2. current vortex range sensor according to claim 1, is characterized in that, described the 3rd amplifier is [5,10] to the enlargement factor of described the first output voltage.
3. a current vortex range sensor, is characterized in that, comprising:
Coil is for generation of magnetic field;
The electric eddy current measurement circuit is connected with described coil, is used for producing the first output voltage according to described magnetic field; And
Differential amplifier is used for the difference of described the first output voltage and reference voltage is amplified, and obtains the second output voltage;
Described electric eddy current measurement circuit comprises coil, electric capacity, phase inverter, the 5th resistance, the 6th resistance, the first amplifier, the second amplifier, feedback element and rectification unit; Wherein,
Described electric capacity and described coils from parallel connection of coils are connected between first node and Section Point;
Described phase inverter one end is connected in the first input end of the first amplifier via the 6th resistance, the other end is connected in the output terminal of the second amplifier;
The second input end of described the first amplifier is via the 5th resistance eutral grounding, and output terminal is connected via the first input end of the 3rd node with the second amplifier;
The second input end of described the second amplifier is connected in the output terminal of the second amplifier via described feedback element;
Wherein, described first node is connected between the first input end of the 6th resistance and the first amplifier, and described Section Point is connected with described rectification unit via the 3rd node, and the output terminal of described rectification unit is described the first output voltage.
4. current vortex range sensor according to claim 3, is characterized in that, described differential amplifier comprises:
First input end is used for inputting described the first output voltage;
The second input end is used for inputting described reference voltage; And
Output terminal is used for exporting described the second output voltage.
5. current vortex range sensor according to claim 3, is characterized in that, described differential amplifier is [5,10] to the enlargement factor of the difference of described the first output voltage and reference voltage.
6. current vortex range sensor according to claim 3, is characterized in that, described differential amplifier is differential amplifier circuit, and this differential amplifier circuit comprises:
Operational amplifier;
The first resistance and second resistance of mutually connecting, first end is connected in the output terminal of described the first output voltage, the second end is connected in the output terminal of described operational amplifier, and wherein, the first input end of described operational amplifier is connected between described the first resistance and described the second resistance;
The 3rd resistance, first end are connected in the output terminal of described reference voltage, and the second end is connected in the second input end of described operational amplifier; And
The 4th resistance, first end are connected between described the 3rd resistance and described operational amplifier, the second end ground connection.
7. current vortex range sensor according to claim 3, is characterized in that, described differential amplifier is differential amplifier circuit, and this differential amplifier circuit comprises:
Substracting unit is for the difference of calculating described the first output voltage and reference voltage; And
Operational amplifier is used for described difference is amplified.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010590458 CN102072694B (en) | 2010-12-15 | 2010-12-15 | Eddy current distance sensor |
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| CN 201010590458 CN102072694B (en) | 2010-12-15 | 2010-12-15 | Eddy current distance sensor |
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| CN102072694A CN102072694A (en) | 2011-05-25 |
| CN102072694B true CN102072694B (en) | 2013-06-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105486220B (en) * | 2015-11-23 | 2018-06-19 | 中国南方航空工业(集团)有限公司 | pitch measuring device |
| CN105387796B (en) * | 2015-12-07 | 2017-12-22 | 贵州新安航空机械有限责任公司 | The detection circuit and its detection method of a kind of inductive displacement transducer |
| CN106225657B (en) * | 2016-08-12 | 2019-12-06 | 安徽容知日新科技股份有限公司 | displacement sensor |
| CN106352787A (en) * | 2016-10-11 | 2017-01-25 | 武汉华宇目检测装备有限公司 | Array pulsed eddy current measurement method and device for ovality of steel pipe |
| CN106441378B (en) * | 2016-10-19 | 2019-03-05 | 珠海格力电器股份有限公司 | Current vortex sensor and its material gear adjust resistance determining method, test method |
| CN107121153A (en) * | 2017-05-22 | 2017-09-01 | 天津大学 | High speed current vortex sensor |
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| CN2359663Y (en) * | 1998-03-09 | 2000-01-19 | 卜建宇 | Integral electric vortex displacement transducer |
| CN2453387Y (en) * | 2000-12-01 | 2001-10-10 | 刘真 | Electric vortex sensor for measuring thickness |
| CN2835946Y (en) * | 2005-06-10 | 2006-11-08 | 北京工业大学 | Electric eddy transducer thickness measurer |
| CN101329155A (en) * | 2008-07-31 | 2008-12-24 | 中国核动力研究设计院 | Electric vortex type displacement clip |
| CN201903320U (en) * | 2010-12-15 | 2011-07-20 | 北京经纬恒润科技有限公司 | Current vortex range sensor |
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Patent Citations (5)
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|---|---|---|---|---|
| CN2359663Y (en) * | 1998-03-09 | 2000-01-19 | 卜建宇 | Integral electric vortex displacement transducer |
| CN2453387Y (en) * | 2000-12-01 | 2001-10-10 | 刘真 | Electric vortex sensor for measuring thickness |
| CN2835946Y (en) * | 2005-06-10 | 2006-11-08 | 北京工业大学 | Electric eddy transducer thickness measurer |
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| CN201903320U (en) * | 2010-12-15 | 2011-07-20 | 北京经纬恒润科技有限公司 | Current vortex range sensor |
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Address after: 4 / F, building 1, No.14 Jiuxianqiao Road, Chaoyang District, Beijing 100020 Patentee after: Beijing Jingwei Hengrun Technology Co., Ltd Address before: 100101 1-2 / F, commercial building, No.23, anxiangli, Chaoyang District, Beijing Patentee before: Beijing Jingwei HiRain Technologies Co.,Ltd. |